In December 2010, the group released undercover footage from Tucson Greyhound Park that documented how dogs live at the Arizona track.

A camera records the reactions of New York City shoppers when they see the undercover footage as Sarah McLachlan's song Angel is heard in the background.

It obtains and publicises undercover footage showing how animals are treated in farms and on slaughterhouses.

Paul Shapiro, campaign director for Compassion Over Killing, said the usual response to undercover footage was denial.

The controversy began when a former employee of the sanctuary took undercover footage showing sick animals and primates confined in small cages.

"A low point," says Tim Brown, the cameraman who shot the report, which included undercover footage of people staring as enhanced men and women walked down the street.

The undercover footage showed staff repeatedly assaulting and harshly restraining patients under chairs.

The documentary was based on undercover footage gathered by Gwynne who posed as a football hooligan looking to get involved in far-right politics.

One of the reporters working on Lopes' team to collect undercover footage for the same investigative report was Globo journalist Cristina Guimarães.